20 
BULLETIN 1451, U. S. DEPARTMENT OF AGRICULTURE 
in various sizes. That used in the experiments was the size of a pea 
and smaller. No notable difference was observed in the effectiveness 
of the different grades of crushed salt, nor was any pronounced 
difference observed in the rate of solution of the various grades. 
When piled around a bush and moistened by rain, the salt cakes and 
does not become completely dissolved for several months. Crushed 
rock salt is not a chemically pure sodium chloride but contains a 
number of different salts. 
Common salt may be procured very cheaply from the mines or from 
producers, but usually is purchased as economically from local deal- 
ers, who obtain it in carload lots. It usually may be purchased 
locally from feed stores, ice-cream manufacturers, hide dealers, 
grocers, and general merchandise stores. It does not require any 
special containers and may be stored without using any precautions 
other than to keep it dry. 
Granulated sodium chloride was applied to the soil in 8-inch flower- 
pots in which barberry plants were growing. A number of plants 
were treated with varying quantities. In a greenhouse test 25 grams 
of salt was found to be sufficient to kill the plants in 10 days. This 
was equivalent to 5 pounds of salt applied in the field to each plant 
of average size. This preliminary greenhouse test was deemed 
sufficiently satisfactory to warrant extending experimentation to the 
field. 
Table 3. 
-Summary of treatments of individual, marked barberry bushes with 
sodium chloride 
1 
Date of Date of final 
treatment observation 
Quan- 
tity of 
chem- 
ical 
to the 
bush 
Method of 
application 
Bushes cut 
off or left 
standing 
Location of j Bushes Bushes 
area treated killed 
♦ 
Per- 
centage 
killed 
Apr. 27,1922 
Do 
Do 
Do 
Do 
Do. 
July 10,1922 
Do 
Oct. 16,1922 
Do 
Oct. 13,1921 
Oct. 31,1921 
July 10,1922 
Do 
Oct. 16,1922 
Do 
Oct. 13,1921 
July 10,1922 
Do 
Oct. 16,1922 
Do 
Oct. 17,1922 
Oct. 31,1921 
Do 
July 3, 1923 
do.. 
do. 
do 
do 
do 
do.. 
do 
do.. 
do 
June 27,1923 
July 3, 1923 
do 
do.. 
do 
do 
June 27,1923 
July 3, 1923 
do 
do 
do 
July 15,1924 
July 3, 1923 
do 
Pounds 
5.0 
5.0 
10.0 
10.0 
15.0 
15.0 
5.0 
5.0 
5.0 
5.0 
8.0 
s, 
10.0 
10.0 
10.0 
10.0 
11.1 
15.0 
15.0 
15.0 
15.0 
16.0 
16.2 
28.0 
In circle of 1- 
foot radius. 
do. 
do .... 
do... 
do 
.....do 
Piled in base... 
do... 
do... 
do... 
do... 
do... 
do 
do 
do. 
do. 
do... 
do-._ 
do... 
do- 
do 
do .... 
do-_ 
do 
Standing.. 
Cut off 
Standing.. 
Cut off- 
Standing.. 
Cutoff- 
Standing.. 
Cut off- 
Standing-. 
Cut off— 
...do 
...do 
Standing.. 
Cut off.... 
Standing.. 
Cut off.... 
Standing.. 
...do 
Cut off 
Standing.. 
Cut off— . 
Standing.. 
...do 
...do 
Gurnee, 
m. 
...do 
...do 
...do 
...do 
...do 
...do 
...do 
...do 
...do 
Marshall, 
Wis. 
Gurnee, 
111. 
...do 
...do 
...do 
...do 
Marshall, 
Wis. 
Gurnee, 
DI. 
...do 
—do 
...do 
...dQ 
...do 
...do 
20 
20 
20 
20 
20 
20 
19 
20 
20 
20 
25 
47 
20 
20 
20 
20 
18 
20 
20 
20 
20 
50 
37. 
14 
17 
13 
19 
20 
19 
20 
19 
18 
20 
20 
25 
47 
20 
20 
20 
20 
18 
20 
20 
20 
20 
50 
37 
14 
85 
65 
95 
100 
95 
100 
100 
90 
100 
100 
100 
100 
100 
100 
100 
100 
100 
100 
100 
100 
100 
100 
100 
100 
Total — 
550 536 
97.5 
1 ; 
